Messages in this thread | | | Date | Fri, 09 Nov 2012 15:12:43 +0200 | From | Marcus Sundman <> | Subject | Re: Debugging system freezes on filesystem writes |
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On 09.11.2012 01:41, Marcus Sundman wrote: > On 07.11.2012 18:17, Jan Kara wrote: >> On Fri 02-11-12 04:19:24, Marcus Sundman wrote: >>> Also, and this might be important, according to iotop there is >>> almost no disk writing going on during the freeze. (Occasionally >>> there are a few MB/s, but mostly it's 0-200 kB/s.) Well, at least >>> when an iotop running on nice -20 hasn't frozen completely, which it >>> does during the more severe freezes. >> OK, it seems as if your machine has some problems with memory >> allocations. Can you capture /proc/vmstat before the freeze and after >> the >> freeze and send them for comparison. Maybe it will show us what is the >> system doing. > > t=01:06 http://sundman.iki.fi/vmstat.pre-freeze.txt > t=01:08 http://sundman.iki.fi/vmstat.during-freeze.txt > t=01:12 http://sundman.iki.fi/vmstat.post-freeze.txt
Here are some more vmstats: http://sundman.iki.fi/vmstats.tar.gz
They are from running this: while true; do cat /proc/vmstat > "vmstat.$(date +%FT%X).txt"; sleep 10; done
There were lots and lots of freezes for almost 20 mins from 14:37:45 onwards, pretty much constantly, but at 14:56:50 the freezes suddenly stopped and everything went back to how it should be.
Thanks, Marcus
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